San Antonio de los Baños Airfield (ICAO: MUSA) is a military air base located near San Antonio de los Baños,[1] a municipality in the province of Havana (La Habana) in Cuba.

On September 9, 1942, Cuba and United States signed a new naval and Military Agreement of Cooperation for a second airfield that would later be known as San Julián Air Base.

The Pinar del Río area was considered ideally situated for further development and the Army began construction by expanding an existing Pan American World Airways emergency landing airfield on 1 November 1942.

In a 1962 briefing paper on the Cuban Missile Crisis prepared by officials at the United States Department of Defense, the base was identified as "the headquarters for the Cuban Revolutionary Air Force and the assembly point for all MiGs, except the MIG-21, which [had] previously been received in Cuba.

"[4] During the Cuban Missile Crisis, Soviet Armed Forces elements deployed as part of Operation Anadyr were based at the airfield.